From dc2c5f41b011f1c2364ec0b2cb11bd39ce4a0742 Mon Sep 17 00:00:00 2001
From: j4hangir <j4hangir@gmail.com>
Date: Fri, 2 Jan 2026 21:50:59 +0100
Subject: [PATCH 1/4] add keepAliveOnHidden option in order to prevent
 mount/unmount on visibility changes

---
 packages/virtual-core/src/index.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 34c51c5b..85e871d6 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -348,6 +348,7 @@ export interface VirtualizerOptions<
   enabled?: boolean
   isRtl?: boolean
   useAnimationFrameWithResizeObserver?: boolean
+  keepAliveOnHidden?: boolean
 }
 
 export class Virtualizer<
@@ -447,6 +448,7 @@ export class Virtualizer<
       isRtl: false,
       useScrollendEvent: false,
       useAnimationFrameWithResizeObserver: false,
+      keepAliveOnHidden: false,
       ...opts,
     }
   }
@@ -499,6 +501,13 @@ export class Virtualizer<
       : null
 
     if (this.scrollElement !== scrollElement) {
+      if (!scrollElement && this.options.keepAliveOnHidden && this.scrollElement?.isConnected) {
+        // We won't call cleanup() here. Keep everything in memory.
+        // Ensure any external subscribers are notified that the state changed.
+        this.maybeNotify()
+        return
+      }
+
       this.cleanup()
 
       if (!scrollElement) {

From aff6e4f4c6e241e28b6274f65f7c58b634374750 Mon Sep 17 00:00:00 2001
From: j4hangir <j4hangir@gmail.com>
Date: Sat, 3 Jan 2026 00:21:12 +0100
Subject: [PATCH 2/4] remove broken return

---
 packages/virtual-core/src/index.ts | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 85e871d6..9496ce8f 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -501,13 +501,6 @@ export class Virtualizer<
       : null
 
     if (this.scrollElement !== scrollElement) {
-      if (!scrollElement && this.options.keepAliveOnHidden && this.scrollElement?.isConnected) {
-        // We won't call cleanup() here. Keep everything in memory.
-        // Ensure any external subscribers are notified that the state changed.
-        this.maybeNotify()
-        return
-      }
-
       this.cleanup()
 
       if (!scrollElement) {

From fde6c6421026ba0711ca3794f19cd1893ca7fbd0 Mon Sep 17 00:00:00 2001
From: j4hangir <j4hangir@gmail.com>
Date: Sat, 3 Jan 2026 00:43:57 +0100
Subject: [PATCH 3/4] fix keepAliveOnHidden

---
 packages/virtual-core/src/index.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index 9496ce8f..bf7124b9 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -795,6 +795,14 @@ export class Virtualizer<
     },
   )
 
+  private isVisible = () => {
+    if (!this.scrollElement) return false
+    return (
+      this.scrollElement instanceof Window ||
+      (this.scrollElement as HTMLElement).offsetWidth > 0
+    )
+  }
+
   calculateRange = memo(
     () => [
       this.getMeasurements(),
@@ -803,6 +811,9 @@ export class Virtualizer<
       this.options.lanes,
     ],
     (measurements, outerSize, scrollOffset, lanes) => {
+      if (this.options.keepAliveOnHidden && !this.isVisible()) {
+        return this.range
+      }
       return (this.range =
         measurements.length > 0 && outerSize > 0
           ? calculateRange({

From 83ad2f6d19cc730d3fc16c967c543607b9b4200e Mon Sep 17 00:00:00 2001
From: j4hangir <j4hangir@gmail.com>
Date: Sat, 3 Jan 2026 03:42:11 +0100
Subject: [PATCH 4/4] fix keepActiveOnHidden not working on measured items

---
 packages/virtual-core/src/index.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts
index bf7124b9..382d3a5b 100644
--- a/packages/virtual-core/src/index.ts
+++ b/packages/virtual-core/src/index.ts
@@ -882,6 +882,9 @@ export class Virtualizer<
     node: TItemElement,
     entry: ResizeObserverEntry | undefined,
   ) => {
+    if (this.options.keepAliveOnHidden && !this.isVisible()) {
+      return
+    }
     const index = this.indexFromElement(node)
     const item = this.measurementsCache[index]
     if (!item) {